title: A compact 10 kW, 476 MHz solid state radio frequency amplifier for pre-buncher cavity of free electron laser injector linear accelerator.
abstract: A 10 kW, 476 MHz, 0.1% duty cycle solid state RF amplifier system for driving sub-harmonic, pre-buncher cavity of IR-FEL injector LINAC, has been developed at RRCAT. The 10 kW power is achieved by combining output of eight 1400 W amplifier modules using 8-way planar corporate combiner. The solid state amplifier modules have been developed using 50 V RF LDMOS transistors which although meant for push-pull operation are being used in single ended configuration with matching circuit developed on a thin (25 mils), high dielectric constant (9.7), low loss microwave laminate with an aim to have a compact structure. Ease of fabrication, modularity, small size, and low cost are the important features of this design which could be used as a template for low duty cycle medium to high pulsed power UHF amplifier system.
authors.affiliation: Raja Rammana Centre for Advanced Technology (RRCAT), Indore 452013, India.
authors.forename: Praveen
authors.initials: P
authors.lastname: Mohania
authors.forename: Ashish
authors.initials: A
authors.lastname: Mahawar
authors.forename: Purushottam
authors.initials: P
authors.lastname: Shrivastava
authors.forename: P D
authors.initials: PD
authors.lastname: Gupta